(KR) - Great blogs posted by Tom DeRosa dating back to July 2007. This blog contains ideas covering many math concepts (geometry, algebra, etc) and there even is a search box that one can conviniently use to find a different approach to teaching specific topics. After running across this blog, I have it bookmarked and it will be one of my main websites I will go to when I am stumped with teaching a concept in a unique way. http://www.teachforever.com/
(ES) http://www.pbs.org/wgbh/nova/education/resources/subj_07_02.html is a great website created by PBS Online with interactive applications of mathematics. The website is a part of NOVA Teachers on the PBS website. The lessons, activities, videos, and problems on this website connect mathematics to history, science, geography, and many other disciplines.
http://www.lessoncorner.com/Math